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Rhythmic movement disorder (RMD) is a neurological disorder characterized by repetitive movements of large muscle groups immediately before and during sleep often involving the head and neck. It was independently described first in 1905 by Zappert as jactatio capitis nocturna and by Cruchet as rhythmie du sommeil . [ 1 ]
It belongs to the hyperkinetic movement disorders, among tremor and chorea for example. These myoclonic twitches, jerks, or seizures are usually caused by sudden muscle contractions (positive myoclonus) or brief lapses of contraction (negative myoclonus). The most common circumstance under which they occur is while falling asleep (hypnic jerk ...
Tremor can also be caused by lack of sleep, lack of vitamins, or increased stress. [11] [12] Deficiencies of magnesium and thiamine [13] have also been known to cause tremor or shaking, which resolves when the deficiency is corrected. [14] Tremors in animals can also be caused by some spider bites, e.g. the redback spider of Australia. [15]
Sometimes, hypnic jerks are mistaken for another form of movement during sleep. For example, hypnic jerks can be confused with restless leg syndrome, periodic limb movement disorder, hypnagogic foot tremor, rhythmic movement disorder, and hereditary or essential startle syndrome, including the hyperplexia syndrome. But some phenomena can help ...
Essential tremor (ET), also called benign tremor, familial tremor, and idiopathic tremor, is a medical condition characterized by involuntary rhythmic contractions and relaxations (oscillations or twitching movements) of certain muscle groups in one or more body parts of unknown cause. [6]
In a study published in Arthritis & Rheumatology, researchers found the number one predictor of widespread pain, especially among adults over 50, is non-restorative sleep, or disruptive sleep ...
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